<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<script type="text/javascript">
let a=10;
let b=5;
let c=10/5;
if(c==0||a>5)
  confirm(c+"很好");
else if(c>0&&a<5)
  confirm(c+"一般");
else
  confirm(c+"很差");
</script>
</body>
</html>